{"id":"CVE-2026-102406","published":"2026-10-06T20:17:12.480","lastModified":"2026-10-08T04:17:08.777","description":"Authorization Bypass Through User-Controlled Key (CWE-639) in Kibana could lead to cross-tenant data interception. In this context, \"tenant\" refers to a user or team sharing the same Kibana deployment, not a separate Elastic Cloud organization or customer. Kibana's Fleet package installation process allowed a user holding delegated Fleet package-management privileges, without direct Elasticsearch administrative privileges, to claim a data stream identifier already in use by another tenant. Because ownership of that identifier was not verified before Fleet applied the uploaded package's generated index and ingest-pipeline settings to already-existing infrastructure, an attacker could redirect an existing tenant's data stream through infrastructure under their control. This exposed the affected tenant's subsequently ingested data to unauthorized disclosure and modification, and prevented that data from reaching its intended destination. Interception could continue even after the malicious package was removed, requiring separate remediation of the affected infrastructure.","cvssScore":8.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwes":["CWE-639"],"vendors":[],"products":[],"references":[{"url":"https://discuss.elastic.co/t/kibana-8-19-22-9-4-7-9-5-4-security-update-esa-2026-187/390860","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"This flaw allows an attacker to bypass authorization and intercept data streams from other tenants in the same Kibana deployment, leading to unauthorized data disclosure and modification.","exploitability":"Exploitation requires a user with delegated Fleet package-management privileges and knowledge of existing data streams, making it moderately difficult.","blast_radius":"If exploited, this flaw could result in significant data exposure and loss of integrity for multiple tenants within the same Kibana deployment.","remediation":"Disable the Fleet package installation feature until a patch is available or upgrade to the latest version of Kibana that addresses this issue.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["auth-bypass","data-interception","kibana","tenant"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-10-08T08:41:43.981Z"}}